dnoonkeste Posted December 25, 2008 Share Posted December 25, 2008 I Have a 2004 Honda Civic EX. How can I tell which O2 sensor is not working? The one at the motor or the one at the catalyic converter. Thanks. Quote Link to comment Share on other sites More sharing options...
Kastigir Posted December 25, 2008 Share Posted December 25, 2008 I Have a 2004 Honda Civic EX. How can I tell which O2 sensor is not working? The one at the motor or the one at the catalyic converter.Thanks. Pull the code. Quote Link to comment Share on other sites More sharing options...
frostedflake Posted December 27, 2008 Share Posted December 27, 2008 you have obd2 so you will need to hook it up to a code reader, you can have it done at autozone for free. Quote Link to comment Share on other sites More sharing options...
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